PHP debugging tool debug_print_backtrace()

If we want to know who called a certain method? debug_print_backtrace can solve it
debug_print_backtrace() can print out the calling process of a page, and it is clear where it comes from.
But this is a proprietary function of PHP5, fortunately There is already an implementation in pear,
http://pear.php.net/package/PHP_Compat

Test code
Copy code The code is as follows:
class a{
function say($msg) {
echo "msg:".$msg;
echo "

";debug_print_backtrace(); 
} 
} 

class b { 
function say($msg) { 
$a = new a(); 
$a ->say($msg); 
} 
} 

class c { 
function __construct($msg) { 
$b = new b(); 
$b->say($msg); 
} 
 } 

$c = new c("test"); 

Output result 
Copy code The code is as follows: 
msg:test 
#0 a->say(test) called at [/var/www/test/test0723 .php:12] 
#1 b->say(test) called at [/var/www/test/test0723.php:19] 
#2 c->__construct(test) called at [/var/www /test/test0723.php:23]